Wheel for dressing stone



April 21,1925.

E. A.CHASE WHEEL FOR DRESSING STONE Filed Jan. 1'7, 192.5

Patented Apr. 21, 1925.

.ELROY A. CHASE, OF NOR'II-IFIELD, VERMONT.

WHEEL FOR DRESSING STONE.

Application fil ed January 17, 1923. Serial No. 613,263.

r T all 10. mm it may concern:

Be it known that I, ELROY A. Cruise, a citizen of the United States,residing at Northfield, in the county of Vashington and State ofVermont, have invented a new and useful Wheel for Dressing Stone, ofwhichithe following is a specification.

This invention relates to a wheel for dressing stone, which isparticularly adapted for use on granite or other similar material. Suchmaterial has a hard crystalline formation and the operation of dressingor rough finishing the stone is to a considerable extent a crushingoperation, particularly in the so-called ironing and coarse grindingoperations.

It is the general object of my invention to provide an improvedconstruction of wheel particularly adapted for producing a smoothsurface on such material as is above described. I p

With this general object in view, I have provided a wheel comprising arotatable supporting structure and a plurality of work enga ing membersdisposedin an outwardly extended series of curved paths on the lowerface of said supporting structure. These members form a. compositeworking face for the wheel and are provided. with a plurality of pocketsor recesses extending entirely through said members from edge to edgeradially of the wheel and distinguished by the fact that the outerportion of the rear wall of each recess is projected forwardly in thedirection of rotation of the wheel to retard outward nnivement'of theworking material. This forward projection of the rear wall is preferablycontinued to a point where the edge of the rear wall ortends'beyond andoverlaps to agrcater or less extent theinner face of the front wall ofthe recess. The pockets or recesses also preferably have inclined rearfaces having a wedge-like action on the working material.

Several forms of my invention are shown in the drawings, inl'ivhich IFig. 1 is a partial plan view of a wheel embodying any improvements Fig.'2 is a sectional elevation taken along the line 2-2 in Fig. 1; 7

Figs. 3 and i are an enlarged detail plan view and side elevationrespectively of one of the pockets indicated in dotted lines in Fig. 1;and

Figs. 5 to la inclusive are similar views of several modified forms ofpockets.

Referring to Figs. 1 to 4, I have indicated a stone dressing wheel ofthe general type shown in my prior application, Serial No. 563,413,filed May 24, 1922. This Wheel comprises a series of grinding members orrings 20 connected by radial arms 21 over lying the rings, the wholeforming a rotatable structure having a driving member 22 that they exerta propeller-like action infeeding the working -material downward throughthe opening 25 to the surface of the stone. The driving head 26 isengaged by a clutch or other device (not shown) at the lower end of asuitable driving shaft and is rotated thereby.

A band 28 of steel is desirably placed around the circumference of thewheel, as the remaining portion of the wheel isusually formed of castiron and is of substantial diameter and is also rotated at a relativelyrapid speed.

In the preferred construction, the rings 20 and arms 21 are cast as asingle element to which is bolted the member 2-2. Vi hcn the grindingrings are worn out the member 22 is removed and is used over again bybolting a new wheel structure thereto.

The construction thus far described substantially as shown in my priorapplicm tion and in itself forms no part of my present invention, whichrelates specifically to certain pockets or recesses 30 formed in theworking faces of the rings 20. These pockets extends entirely throughthe rings. from edge to edge radially of the wheel and may be somewhatvaried in outline as indicated in the several figures of the drawings. 7

In the construction shown in Figs. 1 to 4-, the front wall 31 of thepocket is substantially flat and extends outwardly on a forward incline,while the rear wall 32 is concave in its rear portion and is provided atits outer edge with a forwardly extending portion or lip 33 which tosome extent overlaps the inner edge of the front wall 31 andsubstantially retards outward or centrifugal movement of the wheeldressing material. The con ave portion of the rear wall is alsodownwardly inclined toward the tace of'the wheel so as to produce awedge-like action upon the working material, forcing it un der the wheeland materially increasing the eliective action thereof.

In Figs. 5 and 6, both the front avallfi l and the rear wall 05 aresubstantiallyflat and extend outwardly at substantially the same angle,the rear wall being also inclined to produce the wedge-like action abovedescribed. V I

In Figs, 7 and 8, the front wall 36 is inclined rearwardly instead offorwardly, while the rear wall 37 is projected forwardly at itsouterportion as in the construction previously described.

In Figs. 9 and 10, the construction is similar to l? and .6, except thatthe front wall 38 is convex and the rear wall 39 is concave, the curvesof the two-walls being substantially parallel.

In Figs. 11 and 12, the shape of the pockets 4-0 is quite similar tothat shown in Figs. 9 and 10, but these pockets are formed by separateblocks 41 secured by bolts 42 to to a supporting plate L3, theconstruction 7 in this respect being similar to that shown in my priorapplication, Serial No. 477,005, liledJune- 13, 1921. v V

The constructionshown in Figs. 13 and 14 is in a 'generalwa-y similar tothat shown in Figs. and 4, with the exception that the rear portion 42of. the rear wall is straight instead of concave and that the workingfaces are formed of separate blocks e23 bolted toa plate lat asin Figsll and 12.

The several forms of my invention possess in common the importantcharacteristic that the pockets extend entirely through the rings orworking members and that in each case the outer portion of the rear wallis projeeted' forwardly to retard the centrifugal or outward movement ofthe abrasive or other stone dressing material.

ll' hile I have indicated the rings 20 as being concentrically arranged,it will be understood that my in'iprovements are equally applicable tothe common scroll type of stone dressing wheel.

Having thus described several forms of my invention, it will be evidentthat'other changes and modifications can be made therein by thoseskilled in the art within the spirit and scope of my inyention as setforth in the claims and I do not wish 'to be otherwise limitedto thedetails herein disclosed but what I claim is 1. A wheel for dressingstone having, in combination, a rotatable supporting struc tu re and aplurality of work engaging menihers disposed in an outwardly extendedseries of curved paths on the lower face of said supportingstructure,-said members providing a composite working face for saidwheel and having a plurality of recesses formed in their work engagingfaces, said recesses extending entirely through said a members fro-medge to edge radially of the wheel, jandhaving the outer portion of therear wall of each recess projected forwardly in the direction ofrotation of the wheelto a pointin advance of the inner portion of thefront wall of said recess.

2. A wheel for dressing stone having, in

combination, a rotatable supporting structure and a plurality of workengaging members dis-posed in an outwardly extended series of curvedpathson the lower face of said supporting structure, said membersproviding a composite working face for said wheel and having a pluralityof recesses formed in the1r work engaging faces, said said wheel a'ndhaving a plurality of recesses formed in their work engaging faces, saidrecesses extending entirely through said members from edge to edgeradially of the wheel andthe {front and rear walls of each recess beingrespectively convex and concave and curving forwardly outwardly to forma partial closure of said recess to retard radial movement of theworking material.

4. A wheel for dressing stone having, in combination, a rotatablesupporting structure and a plurality of work engagingmcmhers disposed inan outwardly extended series of curved paths on the lower face of saidsupporting structure, said members providing a composite working facefor said, wheel and having a pluralit) otrecesses formed in their workengaging faces, said recesses extending entirely through a said membersfrom edge toed'ge radially of the wheel, and having the outer portion ofthe rear wall of each recess projected forwardly in the direction ofrotation of the wheel to retard outward movement of the workingmaterial, the rear wall of said recess being also rearwardly anddownwardly inclined to produce a wedge-like action upon the workingmaterial. i

In testimony whereof I have. hereunto at fixed my-signaturfe.

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